Despite a decreasing trend in incidence, stomach cancer is the fourth most common cancer in the world ( Parkin et al , 2005 ).
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However, using premenopausal non-cardia stomach cancer as the outcome, parity was associated with reduced OR of borderline significance (OR=0.82, 95% CI 0.65–1.03).
We found women with more than one child showing borderline significant 30% risk deficit for postmenopausal cardia cancer compared with those with one child.